Turns out it is a CC item in CAS that is messing it up, because I just removed the CAS folder and it woks perfectly.
I'm more than positive my computer is more powerful than the recommended specs. I am also 99.99% sure I am running the x64-bit version of the game. (Where can you check?)
There should be two versions under "The Sims 4\Game\Bin" TS4.exe and TS4_x64.exe. Just launch the game as you normally do then open your windows task manager to see which version is running. The x64 executable is obviously the 64-bit version. Please also run DXDIAG from your command prompt and post the result here (a file link preferred) - if you're running Windows 10, you can add a shortcut to your command prompt by right clicking on your desktop and entering cmd as the executable path.
It is the x64-bit version, and what are the commands to get the file? I have done it for Grand Theft Auto V one time, but I honestly forgot.
Just enter DXDIAG at the prompt - if you don't have a convenient link to your command prompt and the version of windows you're running doesn't have the 'run' option on the start menu, just right click on your desktop, add a new shortcut and enter CMD as the executable path (location of the item).
Here is what it gives me when I type "DXDIAG"...... " 'DXDIAG' is not recognized as an internal or external command, operable program or batch file."
